Traditionally GDAL used to design the raster part of the library, and OGR the vector part for Simple Features. Starting with GDAL 2.0, both sides have been more tightly integrated. You can still refer to the documentation of GDAL 1.X if needed.

Conference

FOSS4G 2019 is the leading annual
conference for free and open source geospatial software. It will include
presentations related to GDAL/OGR, and some of the GDAL/OGR
development community will be attending. It is the event for those
interested in GDAL/OGR, other FOSS geospatial technologies and the community
around them. The conference will be held in Bucharest, Romania,
August 26th - August 30th, 2019.

Mailing List

A gdal-announce mailing list subscription is a low volume way of keeping track of major developments with the GDAL/OGR project.